Yieldable gearing.



A .soN, 'a Citizen of the United States, residingl at Hartford, in the countyg ofI-Iartford and Y' will be set forth fully in the following de sTATEs PATENT oFFIcE.

RENGT M. W. HnNsoN, oF HARTFORD, coNNFcTmUTJs/SIGNOR To PRATT awrriNis'sr` COMPANY, oF HARTFORD, CONNECTICUT, n coRPoRATIoN oFNEW JERSEY.

'YIFLDABEE GEARING.

To all lwhom t may c ocem. l

Be it known that I, BENGT W. HAN- State of Connecticut, haveinvented certain new and useful Improvements in Yieldable Gearing, of which the following is a speciy ication. This invention relates t owhat I shall for, convenience term yieldable gearing.` Gearing involving the invention is susceptible of general use, although itis of especial utility when employed in connection-'with a A spindle, such as the live spindle of a lathe,

being adapted in this particular use to eliminate thepresenoe of chatter marks on the work. y

In lthe drawings accompanying and forming part ef the present specification I have shown in detail one convenient form ofem-v bodiment of thehinvention which vto enable those skilled in the art to practice the same scription. I do not restrictmyself vto this disclosure; I may depart therefrom in several respects within the scopeofthe invention defined by the claims following said `description.-

Refer-ring to said drawings: Figure 1 is a front elevation vpartly in section of the head-stock portion of a lathe em- 'l bodying the invention.

Fig. 2 is an elevation as seen from the right in Fig. 1, of a shock absorbing band and its adjuncts.

Like characters refer to like parts through out both views.

As recognized by those familiar with gear driven lathes, the live spindle is generally equipped with a driven gear usually in the form of abspur gear, rotated lby a companion gear in mesh therewithkthe companion gear, when the driven gear is of `spur form, consisting of a pinion. vOwing to the fact that the drive o the vlive spindle is obtained through meshing gears, the work shows chatter marks, the latter progressively increasing as the backlash between the gears increases. It is the fundamental object to provide means'by which these marks \will not showy on the work,1the consequence being that by virtue of theinvention I can obtain dressed or turned eing free of protrusions.

Specification of Letters Patent. I

s maybe inferred I' do not restrict myself to'4 any particular means whereby this im' Patentea Feb.: 27,1917.' Appneatiqn ined January 1o, 191e. sevrial No.'7'1,31 s. y

portant result can b e obtained, although in.

the drawings I show van organization ex-v cellently Vadapted to insure the necessary function. 1

In Fig. 1. the numeral 2 denotes the bed orv base and 3 ahead-stock. Thehead-stock 3 is furnished with bearings 4 and 5 Awhich Jointlysupporththe live spindle 6 for rotation, the livespindle being provided with the necessary-accessories such as a face plate,

anda driver dog, neither of which, however, is

shown. The spindle 6.' turns in the bushings 7 and 8 fitting the bearings 4 and 5 respectively, the driven gear 9 being supported by' the .live spindle but not dlr'ectly carried thereby, being Shown as keyed tothe sleevel 10 which is loose on the bushing 8. -From 4 -this it will be clear that the gear 9 is loose with respect yto the live spindle, the twobe-y ing capable of relative rotation. As a means for rotating the spur gear 10 theepinion 11 may`be utilized, said pinion being carried by` the shaft 12.' I It will 'be clear that on. the rotation of the pinion 11 the spur gear 9 will be rotated.

. In the present case the eHect of the drivenv gear 9 which constitutes a driver for the spindle 6 is transferred to the latter through shock absorbing means, which may \fory instance consist of a pad of ap roximately an# v nular form as will hereina ter appear, the

shock absorbing means taking up the shock of the gear` 9 so that the motion. of the latter g' will vbe transferred to the spindle 6- in al uniform, evei and smooth manner. Iprefer that the said pad or .equivalent -memberbf whatever nature it may be shallhave a non.

slip connection with the live spindle I,I have lshown as rotative with the spindle 6 the disk 13. Said disk may as shown be keyedl to the .band 16 of somesuitable resilient or -com-l pressible material such. for instance as leather.v This band is divided or split and is caused to closely hug or embrace the gear 9 and cooperating disk 13. i

spindle, being adjacent to they gear vk9 both as will be understood,l,rotating in the space bef In adj acent vThe leather band 16 is held in gripping engagement with said gear 9 and vflask- 13 in some convenientmanner as by means of the practically similar split clampingx bands 17, one clamping band 17'encircling the leather band -16 Where the same fits in the groove or rabbet 14 and the other clamping band y17 inclosing said leather band VWhere 'it enters the rabbet lor groove 15. As the two split bands-17 are the same in construction a detailed description of one will apply to the other.b Said split metallic band 17 as shown comprises two duplicate sections or semi-circular segments,lone of Which is connected With a block 18 and the other with a block 19 at .the lends thereof. One end of the other'section of said band 17 is con- .nected With the block` 20, ywhile ythe other end thereof is connected .with theblock 21. The ends of the sections of said split band l17 may be voffset and soldered in notches in Ithe leather band 16 and that the-several screws 22, of which there are four have been tightened to cause the two metallic bands 17 to draw the leather band 16-in firm engagement with the gear 9 and the disk 13.

rThis is a simple construction for non-vibratingly transferring the effect of the gear 9 to the spindle 6, the consequence being that when the gear 11 is rotated the spindle 6 will through the intermediate partsl be driven in a uniform manner and can through the customary driver impart like movement to the work'.

lVhat 1 claim is:

1. The combination of a spindle, an element rotative with the spindle, a driver for the spindle rotative with respect thereto, andresilient means for transferring power from the driver to said element to rotate the latter and pro-vided with means for holding the same in rigid and against slipping relation with both said driver and said element.

2. The combination of a spindle, a driver for the spindle rotative with respect thereto, and Lshock absorbing means for transferring power from the driver to said spindle and provided with means for maintaining said shock absorbing means in rigid and against The blocks 18 and 19 have` vslipping relation with both the driver and the element.

3. The combination of a spindle, a disk rotative with the spindle, a gear rotative with respect to the spindle, and a resilient shock absorbing band in gripping circumeriential engagement with the gear and the 1S l 4. rlhe. combination of a spindle, an element fastened to said spindle, a driver for the spindle rotative with respect thereto, and

la resilient power transferring member in adjacent faces,- and a leather band set intov the rabbets and in clamping engagement with the bodies of said rabbets.

7 rllhe combination of a spindle, a disk rotative with said spindle, agear rotative with respect to the spindle and coaxial with the disk, the gear having a toothed peripheral portion and a plain peripheral portion, and a shock absorbing band in' gripping engagement with the peripheral plain portion of the gear and the peripheral portion of the disk.

8. The combination of al spindle, a disk fixed to and rotative withsaid live spindle, a gear loose on and rotative with respect to the spindle, a leather band surrounding the peripheries of the gear and the disk, and divided metallic band means for clamping the leather band to the gear and the disk.

9. rlihe combination of a spindle, a gear supported by and rotative with respect to ,the spindle, a second gear in mesh with the first gear, a disk fastened to the spindle for rotation therewith, and shock absorbing means for transferring the effect of the gear to the disk and provided with means for holding the same in clamped relation with both the gear and the disk.

ln testimony whereof l ahix my signature. in presence of two Witnesses.

BENGT M. "W. HANSON. Witnesses:

Vf. M. Sr'onns, C. M. GELLERT. 

